Smoking damages gum tissue and causes gum recession, leaving the roots of the teeth exposed. This could increase the risk of tooth decay and cause hot/cold sensitivity due to the exposure of sensitive nerve endings that are covered by the gum line. The high temperatures inhaled during smoking can irritate the gums and lead to teeth sensitivity. However, definite diagnosis in your case will require your oral examination.
Quitting smoking is the most effective way to ensure better oral health.
Next Steps
Quit smoking. Visit the dentist for definite clinical evaluation and treatment.
Health Tips
Brush twice a day gently using soft toothbrush. Maintain good oral hygiene.